Motion picture machine and the like



March 9, 1937. J. H. M NABB MOTION PICTURE MACHINE AND THE LIKE FiledMay 31, 1954 3 Sheets-Sheet l I l I l March 9, 1937. J. H M NABB MOTIONPICTURE MACHINE AND THE LIKE Filed May 31, 1934 3 Sheets-Sheet 2 March9, 1937. J. H. McNABB 2,073,538

' MOTION PICTURE MACHINE AND THE LIKE Filed May 31, 1934 3 Sheets-Sheet3 Patented Mar. 9, 1937 MOTION PICTURE MACHINE AND THE LIKE Joseph H.McNabb, Winnetka, 111., asslgnor to The Bell & Howell Company, Chicago,111., a

corporation of Illinois Application May 31, 1934, Serial No. 728,270

2 Claims.

My invention relates particularly to motion picture projecting machinesalthough not limited to this use alone.

The invention has for 5 provision of novel and efiective means forhumidifying a film, such as a motion picture film, as it is fed, theinvention in its specific application contemplating the humidiflcationof a film as it is projected, thus offsetting the drying efiect 1c ofthe heat of the projection light upon the film at the exposure aperture.

With this object in view my invention consists in certain features ofnovelty in the construction, combination, and arrangement of parts itsmain object the 15 by which the said object and certain other objects,hereinafter appearing, are efiected, all as fully described withreference to lug drawings and more in the appended claims.

90 In the said cirawings- Figure 1 is a partial side elevation oi amotion picture projecting machine emhodying my in= vention, with partsbroken away and shown in section;

Figure 2 is a partial top plan view of the same with parts broken awayand shown in section;

Figure 3 is a partial section talzen on the line 3-3 of Figure 2.

Referring to the drawings, i'designates the base of the machine, whichis hollow, and mounted on the lease is a projector frame '2 whichincludes a lamp house 3 within which is mounted an incandescent electricprojection lamp d. Elm feeding mechanism is carried on the frame 2 andis inclusive of an exposure apez'turecl intermittent which a film 6 isintermittently fed as usual by intermittent film feeding mechanism notshown and constant teed sprockets l for feeding the film to and from theguide 95. See Figures 1, 2 and 3.

The film is fed to the feeding mechanism from a revolulale reel 8carried on an arm 9 which is mounted on the frame 2, and is taken upfrom the feeding mechanism upon a revoluhle reel it carried on an arm 52which is mounted on the frame 2, take up the film by an electric motordriving device generally designated at it. See Figure 1.

An electric driving motor, generally designated at H, is mounted on theframe 2 on a forwardly and rearwardly projecting axis, and its shaft itextends forwardly for driving the dim feeding mechanism, sayin themanner illustrated 65 in U. S. Patent No. 1,587,955, granted June 8,

the accompanyparticulorly pointed out film feed guide it through thereel it being driven to 1926, on application of A. S. Howell, forimprovement in Motion picture projecting machine and the'like. SeeFigures 2 and 3.

Secured on the motor shaft 95 within an enclosure I 6 of the frame l isa double centrifugal fan li, each portion of which is constructedsimilarly to that described in U. S. Patent No. 1,897,947, grantedFebruary 14, 1933, on application of A. S. Howell, for improvement inFan structure, and the enclosure it communicates directly with the lamphouse it, see Figure 8, and with the enclosure of the base i by apassage it. See Figures 2 and 3.

The motor it rotates counter clockwise, as indicated by the arrow inFigure 3, and air is drawn through openings to in the frame 2, seeFigure 2, to the center oi the fan ii and is ejected from the peripherythereof into the lamp house 3 for cooling the lamp l, one portion 01 theair current induced by the fan issuing through a perforated top ii onthe lamp house, and another portion of this air current, which, isheated by the heat dissipated by the lamp, issuing into the enclosure ofthe lease 9 through the passage 93.

The enclosure oi the base i is provided with a downwardly projectingpartition structure and a bottom plate 23 is secured upwardly there=against to form, with the sides of the base, an enclosure ti l intowhich the passage it? enters. See Figures 1 and 3.

The side of the base i adjacent the film path plane is provided with anopening communieating with the enclosure 2 and. a hollow projecting capit is secured on the exterior this side of the base and continues theopening 25. See Figures 1, 2 and 3.

The cap 263 is provided with-a diametrical slot 2?? through which thefilm ti passes from the lower constant iced sprocket a in its passagefrom the film feeding mechanism to the take up reel ii, a revolubleguide roller 28 mounted on the base i below the cap 26 cooperating withthe lower sprocket l in grueling the film through the slot, 2?. SeeFigure 1.

From the roller 26 the film ti passesrearwardly under and about anotherrevoluble guide roller 25) mounted on the base i, and thence upwardlyand reversely about another guide roller 3i mounted on a springtensioned arm 32 pivotally mounted on the base, and thence upwardly tothe driven take up reel ii.- 7

The sideof the base i, opposite that on which the cap 26 is disposed, isprovided with an opening it communicating with the enclosure 26, and

screwthreaded into this opening for .ready' removal is a plug 36. SeeFigure 3. Secured on the inside of this plug and projecting axiallythereof is a perforated hollow cylinder 35 within which is containedabsorbent material 36 capable of absorbing for gradual dissipation ahumidifying agent such as water, the perforations of the cylinder 35providing for the dissipation of the humidifying agent.

In operation the film 6 is fed downwardly through the exposure aperturedintermittent film feed guide where it is subjected to the projectionlight of the lamp 3, then through the closure of the cap 26, and isfinally Wound on the take up reel ii.

During the projection operation the fan ll induces an air currentthrough the lamp house 3 for cooling the lamp 3 and induces an aircurrent, heated by the lamp 3, through the passage it, the enclosure 25,the enclosure of the cap 21% and over the film in the cap and outthrough the slot 27, thus subjecting the film to the heated air current.As the heated air current'passes through the enclosure 2t it absorbsmoisture from the previously moistened material '36 in the perforatedcylinder 35 and transmits it to the film, the heating of the air currentmaterially assisting in the humidifying operation.

Preferably,'as shown, the film is subjected to V humidification after itpasses the projection staprojection therefrom.

Having thus described my invention, I ,do not wish to be limited to theprecise details described as changesmay be readily made withoutdeparting from the spirit of my invention, but having thus described byinvention, I claim as new and desire to secure by Letters Patent thefollowing:

1. In a motion picture projecting machine the combination withprojection means includin film feeding means, a projection lamp and aclosure for said lamp, of a fan for inducing an air current through saidclosure for cooling said lamp, additional closure means having an intakeassociated with said fan and lamp closure and an outlet associated witha film fed by said feeding means and adapted to direct a current of airinduced by said fan and heated by said lamp onto said film, anda'humldifying device associated with said additional closure meansintermediate said intake and outlet and adapted to humidity said heatedair current.

2. In a motion picture projecting machine the combination withpridjection means including film feeding means, a projection lamp and aclosure for said lamp, of a film. reel associated with said feedingmeans, a motor for driving said feeding means, a fan driven by saidmotor for inducing an air current through said closure for cooling saidlamp, additional closure means having an intake associated with said fanand lamp closure and an outlet slot through which a film fed by saidfeeding means passes between said feeding means and said reel andadapted to direct a current of air induced by said fan and heated bysaid lamp onto said film at said outlet slot, and a humidir'ying deviceassociated with said additional closure means intermediate said intakeand said outlet slot and adapted to humidify said heated air current.

' JOSEPH'H. MCNABB.

